Elbaite and Bertrandite Physical Properties

Elbaite

Bertrandite

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Physical Properties

Tenacity

Solubility

Durability

Specific Gravity

2.90-3.102.59-2.60

1 7.18

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Fracture

Uneven, Conchoidal

Cleavage

Poor/indistinct on {1120} and {1011}

{001} Perfect, {110} Distinct, {101} Distinct

Mohs Hardness

76-7

2 10

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Chemical Composition

Na(Li 1.5Al 1.5)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012) More from other references

Be 4Si 2O 7(OH) 2Anthony et al , Handbook of mineralogy (2001)

Elbaite and Bertrandite Chemical Formula

While comparing Elbaite and Bertrandite physical properties, the important data you should know is its chemical composition. Since chemical formula defines the molecular structure of the crystal, most of the physical properties like color, tenacity, solubility are governed by Elbaite and Bertrandite chemical formula.

Chemical formula of Elbaite- Na(Li 1.5Al 1.5)Al 6(Si 6O 18)(BO 3) 3(OH) 3(OH)Gemdat.org , Management Team (2012) More from other references
Chemical formula of Bertrandite- Be 4Si 2O 7(OH) 2Anthony et al , Handbook of mineralogy (2001)

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Elbaite and Bertrandite Specific Gravity

Another important criteria for qualitative analysis of gemstones is Elbaite and Bertrandite Specific gravity. Specific gravity is the relative density of a gemstone compared with respect to density of water. Gemologists use Elbaite and Bertrandite Optical Properties during the identification of gemstone. Specific gravity of Elbaite is 2.59-2.60 whereas that of Bertrandite is 2.59-2.60.